Panic when running any of the examples under Linux Intel GPU

[ancwrd1]

Environment:

openSUSE Tumbleweed, kernel 5.3.11.
KDE Plasma 5.17.3
System font: Noto Sans
Mesa DRI Intel(R) HD Graphics 620 (Kaby Lake GT2)
Mesa 19.2.4
Vulkan Instance Version: 1.1.127

Running cargo run --example tour causes panic with the following stack trace (snipped):

  15: core::result::Result<T,E>::unwrap
             at /rustc/4560ea788cb760f0a34127156c78e2552949f734/src/libcore/result.rs:933
  16: wgpu_glyph::builder::GlyphBrushBuilder<()>::using_fonts_bytes::{{closure}}
             at /home/dmitry/.cargo/registry/src/github.com-1ecc6299db9ec823/wgpu_glyph-0.6.0/src/builder.rs:44
  17: core::iter::adapters::map_fold::{{closure}}
             at /rustc/4560ea788cb760f0a34127156c78e2552949f734/src/libcore/iter/adapters/mod.rs:694
  18: core::iter::traits::iterator::Iterator::fold::ok::{{closure}}
             at /rustc/4560ea788cb760f0a34127156c78e2552949f734/src/libcore/iter/traits/iterator.rs:1813
  19: core::iter::traits::iterator::Iterator::try_fold
             at /rustc/4560ea788cb760f0a34127156c78e2552949f734/src/libcore/iter/traits/iterator.rs:1694
  20: core::iter::traits::iterator::Iterator::fold
             at /rustc/4560ea788cb760f0a34127156c78e2552949f734/src/libcore/iter/traits/iterator.rs:1816
  21: <core::iter::adapters::Map<I,F> as core::iter::traits::iterator::Iterator>::fold
             at /rustc/4560ea788cb760f0a34127156c78e2552949f734/src/libcore/iter/adapters/mod.rs:727
  22: core::iter::traits::iterator::Iterator::for_each
             at /rustc/4560ea788cb760f0a34127156c78e2552949f734/src/libcore/iter/traits/iterator.rs:616
  23: <alloc::vec::Vec<T> as alloc::vec::SpecExtend<T,I>>::spec_extend
             at /rustc/4560ea788cb760f0a34127156c78e2552949f734/src/liballoc/vec.rs:1966
  24: <alloc::vec::Vec<T> as alloc::vec::SpecExtend<T,I>>::from_iter
             at /rustc/4560ea788cb760f0a34127156c78e2552949f734/src/liballoc/vec.rs:1949
  25: <alloc::vec::Vec<T> as core::iter::traits::collect::FromIterator<T>>::from_iter
             at /rustc/4560ea788cb760f0a34127156c78e2552949f734/src/liballoc/vec.rs:1836
  26: core::iter::traits::iterator::Iterator::collect
             at /rustc/4560ea788cb760f0a34127156c78e2552949f734/src/libcore/iter/traits/iterator.rs:1478
  27: wgpu_glyph::builder::GlyphBrushBuilder<()>::using_fonts_bytes
             at /home/dmitry/.cargo/registry/src/github.com-1ecc6299db9ec823/wgpu_glyph-0.6.0/src/builder.rs:41
  28: iced_wgpu::text::Pipeline::new
             at wgpu/src/text.rs:36
  29: iced_wgpu::renderer::Renderer::new
             at wgpu/src/renderer.rs:64
  30: <iced_wgpu::renderer::Renderer as iced_native::renderer::windowed::Windowed>::new
             at wgpu/src/renderer.rs:417
  31: iced_winit::application::Application::run
             at ./winit/src/application.rs:115
  32: iced::application::Application::run
             at ./src/application.rs:140
  33: iced::sandbox::Sandbox::run
             at ./src/sandbox.rs:128
  34: tour::main
             at examples/tour.rs:10

[hecrj]

Thanks for the report!

Could you provide the output of fc-match sans-serif and fc-match serif?

[ancwrd1]

Here is it:

fc-match sans-serif
arial.ttf: "Arial" "Regular"

fc-match serif
times.ttf: "Times New Roman" "Regular"

[hecrj]

Thanks! I believe those fonts should work fine.

I forgot we are also currently loading a mono font for the overlay view. Sorry. Could you provide the output of fc-match monospace as well?

[ancwrd1]

Sure:

fc-match monospace
SourceCodePro-Regular.otf: "Source Code Pro" "Regular"

I guess that's where it breaks.

[ancwrd1]

I changed the preferred monospace font to something else (Noto Mono) and now it starts correctly.

[hecrj]

@Dremon Glad to know! And yes, OpenType fonts are not completely supported by rusttype.

We may be able to fix this by contributing to font-kit and adding a method to request a list of matching fonts. Somewhat related is servo/font-kit#62. I will investigate further.

Thank you again for the report :)

[Karrq]

I also have this issues, as all my fonts are OpenType fonts, specifically NimbusSans for sans-serif, NimbusRoman for serif, and NimbusMonoPS for monospace.

I believe these fonts are from KDE which is my desktop environment on Arch Linux.

[ironhouzi]

Same issue.

$ fc-match sans-serif
Vera.ttf: "Bitstream Vera Sans" "Roman"

$ fc-match serif
VeraSe.ttf: "Bitstream Vera Serif" "Roman"

$ fc-match monospace
DroidSansMono.ttf: "Droid Sans Mono" "Regular"

[hecrj]

Sorry to hear that.

This is one of the main reasons I think having a renderer alternative is important. iced_wgpu still needs to mature quite a bit.

In the meantime, maybe we could avoid panicking in wgpu_glyph and embed a fallback font that is guaranteed to work for these cases.

[hecrj]

I have opened #74, which should fix the issue.

[FuGangqiang]

when I use unicode text: 欢迎，get an render error, but the unicode title render right

impl<'a> Step {
   fn welcome() -> Column<'a, StepMessage> {
       Self::container("Welcome!")
           .push(Text::new(
               "欢迎, \
               This is a simple tour meant to showcase a bunch of widgets \
                that can be easily implemented on top of Iced.",
           ))
           .push(Text::new(
               "Iced is a cross-platform GUI library for Rust focused on \
                simplicity and type-safety. It is heavily inspired by Elm.",
           ))
           .push(Text::new(
               "It was originally born as part of Coffee, an opinionated \
                2D game engine for Rust.",
           ))
           .push(Text::new(
               "On native platforms, Iced provides by default a renderer \
                built on top of wgpu, a graphics library supporting Vulkan, \
                Metal, DX11, and DX12.",
           ))
           .push(Text::new(
               "Additionally, this tour can also run on WebAssembly thanks \
                to dodrio, an experimental VDOM library for Rust.",
           ))
           .push(Text::new(
               "You will need to interact with the UI in order to reach the \
                end!",
           ))
   }
}

[FuGangqiang]

the unicode 欢迎(welcome) is CJK character

[hecrj]

@FuGangqiang We do not support font fallback nor text shaping yet! This is being tracked in #33.

[FuGangqiang]

thanks for remind

[hanckmann]

I am really interested in using this UI library, but I the same (?) error as posted by dremon.
Is it useful to provide system details or more error logs?

λ ~/ fc-match sans-serif
DejaVuSans.ttf: "DejaVu Sans" "Book"
λ ~/ fc-match serif
DejaVuSerif.ttf: "DejaVu Serif" "Book"
λ ~/ fc-match monospace
DejaVuSansMono.ttf: "DejaVu Sans Mono" "Book"

Does this mean that the DejaVu fonts are not supported?

[hecrj]

@hanckmann fc-match produces the same output on my system. Overall, TrueType fonts should work. Does #74 fix the issue? If not, I'd appreciate it if you could provide a stack trace there.

[hanckmann]

I just checked out the latest version from master and tried to compile/run it.
I suppose that #74 did not fix the issue for me.
This is my stack trace:

λ ~/Projects/rust/iced/ master export RUST_BACKTRACE=1
λ ~/Projects/rust/iced/ master cargo run --example tour
    Finished dev [unoptimized + debuginfo] target(s) in 0.66s
     Running `target/debug/examples/tour`
thread 'main' panicked at 'called `Option::unwrap()` on a `None` value', src/libcore/option.rs:378:21
stack backtrace:
   0: backtrace::backtrace::libunwind::trace
             at /cargo/registry/src/github.com-1ecc6299db9ec823/backtrace-0.3.37/src/backtrace/libunwind.rs:88
   1: backtrace::backtrace::trace_unsynchronized
             at /cargo/registry/src/github.com-1ecc6299db9ec823/backtrace-0.3.37/src/backtrace/mod.rs:66
   2: std::sys_common::backtrace::_print_fmt
             at src/libstd/sys_common/backtrace.rs:76
   3: <std::sys_common::backtrace::_print::DisplayBacktrace as core::fmt::Display>::fmt
             at src/libstd/sys_common/backtrace.rs:60
   4: core::fmt::write
             at src/libcore/fmt/mod.rs:1030
   5: std::io::Write::write_fmt
             at src/libstd/io/mod.rs:1412
   6: std::sys_common::backtrace::_print
             at src/libstd/sys_common/backtrace.rs:64
   7: std::sys_common::backtrace::print
             at src/libstd/sys_common/backtrace.rs:49
   8: std::panicking::default_hook::{{closure}}
             at src/libstd/panicking.rs:196
   9: std::panicking::default_hook
             at src/libstd/panicking.rs:210
  10: std::panicking::rust_panic_with_hook
             at src/libstd/panicking.rs:473
  11: std::panicking::continue_panic_fmt
             at src/libstd/panicking.rs:380
  12: rust_begin_unwind
             at src/libstd/panicking.rs:307
  13: core::panicking::panic_fmt
             at src/libcore/panicking.rs:85
  14: core::panicking::panic
             at src/libcore/panicking.rs:49
  15: core::option::Option<T>::unwrap
             at /rustc/4560ea788cb760f0a34127156c78e2552949f734/src/libcore/macros.rs:12
  16: wgpu_request_adapter
             at /home/user/.cargo/registry/src/github.com-1ecc6299db9ec823/wgpu-native-0.4.0/src/instance.rs:474
  17: wgpu::Adapter::request
             at /home/user/.cargo/registry/src/github.com-1ecc6299db9ec823/wgpu-0.4.0/src/lib.rs:545
  18: iced_wgpu::renderer::Renderer::new
             at wgpu/src/renderer.rs:51
  19: <iced_wgpu::renderer::Renderer as iced_native::renderer::windowed::Windowed>::new
             at wgpu/src/renderer.rs:417
  20: iced_winit::application::Application::run
             at ./winit/src/application.rs:115
  21: iced::application::Application::run
             at ./src/application.rs:140
  22: iced::sandbox::Sandbox::run
             at ./src/sandbox.rs:128
  23: tour::main
             at examples/tour.rs:10
  24: std::rt::lang_start::{{closure}}
             at /rustc/4560ea788cb760f0a34127156c78e2552949f734/src/libstd/rt.rs:64
  25: std::rt::lang_start_internal::{{closure}}
             at src/libstd/rt.rs:49
  26: std::panicking::try::do_call
             at src/libstd/panicking.rs:292
  27: __rust_maybe_catch_panic
             at src/libpanic_unwind/lib.rs:80
  28: std::panicking::try
             at src/libstd/panicking.rs:271
  29: std::panic::catch_unwind
             at src/libstd/panic.rs:394
  30: std::rt::lang_start_internal
             at src/libstd/rt.rs:48
  31: std::rt::lang_start
             at /rustc/4560ea788cb760f0a34127156c78e2552949f734/src/libstd/rt.rs:64
  32: main
  33: __libc_start_main
  34: _start
note: Some details are omitted, run with `RUST_BACKTRACE=full` for a verbose backtrace.

My system info:
ArchLinux [Linux version 5.3.13-arch1-1 (linux@archlinux) (gcc version 9.2.0 (GCC)) #1 SMP PREEMPT Sun, 24 Nov 2019 10:15:50 +0000]
DE: xfce4 4.14
WM: i3-wm 4.17.1-1
lspci video: 00:00.0 Host bridge: Intel Corporation Haswell-ULT DRAM Controller (rev 0b)

If there is any more info you need, just let me know!

[hecrj]

@hanckmann Thanks for the trace.

This is not exactly the same issue, as it's not font related. wgpu cannot seem to find a suitable graphics adapter, as per this line:

16: wgpu_request_adapter
at /home/user/.cargo/registry/src/github.com-1ecc6299db9ec823/wgpu-native-0.4.0/src/instance.rs:474

I am aware the panic message does not help much (the issue for that is gfx-rs/wgpu#368).

I would try to make sure your Vulkan drivers are installed correctly: Vulkan - ArchWiki. Even if that does not fix the issue, I am working on a renderer alternative that should be able to fallback to software mode in these cases.

[hanckmann]

You are right, it is indeed due to not having installed the vulkan driver. Thanks for the hint, but yes... the error message is not very helpful at all.

[dessalines]

I'm getting this also on linux. The error message tells nothing, but the extended stack says its wgpu :

  15: core::option::Option<T>::unwrap                                                                             
             at /rustc/4560ea788cb760f0a34127156c78e2552949f734/src/libcore/macros.rs:12                          
  16: wgpu_request_adapter                                                                                        
             at /home/aaa/.cargo/registry/src/github.com-1ecc6299db9ec823/wgpu-native-0.4.1/src/instance.rs:474 
  17: wgpu::Adapter::request                                                                                      
             at /home/aaa/.cargo/registry/src/github.com-1ecc6299db9ec823/wgpu-0.4.0/src/lib.rs:545             
  18: iced_wgpu::renderer::Renderer::new
             at /home/aaa/.cargo/registry/src/github.com-1ecc6299db9ec823/iced_wgpu-0.1.0/src/renderer.rs:51
  19: <iced_wgpu::renderer::Renderer as iced_native::renderer::windowed::Windowed>::new
             at /home/aaa/.cargo/registry/src/github.com-1ecc6299db9ec823/iced_wgpu-0.1.0/src/renderer.rs:417

Edit: okay the fix for arch linux is to install vulkan-intel

[zhangchunlin]

Also run into this problem with latest source code

~/sandbox/iced/iced/target/debug$ fc-match sans-serif
NotoSansCJK-Regular.ttc: "Noto Sans CJK SC" "Regular"
~/sandbox/iced/iced/target/debug$ fc-match serif
uming.ttc: "AR PL UMing CN" "Light"
~/sandbox/iced/iced/target/debug$ fc-match monospace
DejaVuSansMono.ttf: "DejaVu Sans Mono" "Book"

[zhangchunlin]

After read #422 , I can run with this kind of command: cargo run --features glow --package todos